<!DOCTYPE html>
<html lang="en">
<head>
	<script type="text/javascript" src="js/jquery-1.6.js"></script>
</head>
<body>
<p id="paragrafo" style="background:yellow">
Teste de jquery
</p>
<input type="button" id="btnMuda" value="Change!"></input>
<script type="text/javascript" language="javascript">

	$('#btnMuda').click(function(){
		$('#paragrafo').css('background','blue').fadein();
	});
</script>
</body>